Spark-plug



WI F. SPRENGNETHEH.

SPARK PLUG.

APPllcATloN man APH.|4.19|9.

Patented July 22, 19W.

A TTOR/VEX WILLIAM F. SPRENGNETHER, F ST. LOUIS, MISSOURI,

SPARK-PLUG.

Specification of Letters Patent.

Patented July 22. 1919.

Application Med April 14, 1919. Serial N0. 289,791.`

To all wlw/H it muy conf-ern:

Be it known that 1', lVlLLIAM l". Scannoxiz'riinn, a citizen of theluited States, residing at St. Louis, State of Missouri, have inventedcertain new and useful Improvements in Spi\i'k-ll1|gs, of which thefollowings is a full, clear. and exact description,

yreference being had to the accompanying d ra wings, formin a parthereof'` My invention ias relation to improvements in spark-plugs forexplosive engines and is directed more particularly to that kind of plugwhich is readily removable for inspection; and it consists in the novelconstruction more fully set forth in the specification and pointed outin the claims.

ln the drawings. Figure 1 is a lsection of the upper part of an envinecylinder with the spark-plug applied thereto; Fig. is a top plan of thespark-plug; Fig. 3 is a side elevation ot' the plug; Fig. l is a front`elerat ion ot' the saine: and Fig. 5 is a side elevation of thespark-plug proper detached from the holder.

The present invention is directed to a spark-plug provided with a holder`from which it may be easily and quickly detached, at the same timepermitiing of a simple and durable construction that, can hemanufactured at small cost; further advantages will he better apparentfrom a detailed deseription of the invention which is as follows:

Referring to the drawings, E represents an engine cylinder into the headof which a threaded socket 1 provided with a hexa, onal portion 2, isscrewed. The spark plug iroper consists of a cylindrical metallic,casing 3, provided with an exterior Bange (1,'

and interior shoulder b, said easing receiving a porcelain insulator 4having an annii-lar enlarged portion or flange d, said flange resting onthe shoulder b of the casing 23 and being held in place by a screwplug 5threaded into the upper part of the casing. The plug is also providedwith an electrode ti, inside the insulator 4, terminating in a terminal7 from which a. wire lw leads, and a short electrode 8 secured into the,lower end of the casing 3. These latter features are well known in theart.

The spark-plugr propel' is inserted into thel socket 1, the casing 3passing throughv the, opening of the socket 1, a gasket 9 beinginterposed between the flange a of the casinalr and the hexagonalportion 2 of the socket. A yoke 10 is pivotally secured to oppositefaces f, f, of the hexaeonal portion 2. by'a pair of links 11. 11. saityoke also being pivoted to the links I1, 11, by means of pins 12, 12,thus permittin r the yoke 10 to straddle the upper part of" the casin 3and rest on the flange a of the casing. he yoke 10 is provided with acentrally disposed lug 13 on its upper edge e, through which a set screwH passes. The manner of securing the sparkqilug into the socket andremoving the same may be described as follows:

After the spark-plug has been inserted into the socket O. the yoke isbroughtJ up over the flange a upon which it rests, and the set screw 14is screwed down tightly against said tiange. The pressure of the setscrew clamps the spark-plug firmly into the socket between the yoke 10andthe hexagonal portion Q of the socket, as shown full in Fig. 3. lnorder to release the spark-plu the set-screw is unscrewed and the yoke nlowed to drop downto the position shown dotted in Fig. 3. whereupon thespariplug can be lifted out of the socket.

It is obvious that with a sufficient amount of slack in the wire fw, thespark-plug can be removed from the socket and leid on the engine, whereits operation maybe readily dbserved with little or no trouble. If foundto be operating satisfactorily it canbe just as easily slipped back intoplace.

Having described my linvention what I claim is: Y

1. A spark-plug provided with a metallic easing, sind easing having anannular Bange, a socket adapted to/receive said spark-plug, a pair oflinks pivotally secured to said soc et, a yoke pivotally secured to saidlinks, and a set-screw passing through the yoke and adapted to bear uponthe annular flange of the metallic casing.

2. A spark-plug providedwith a metallic casing said easing having anannular flange, an exteriol y screw-threaded socket adapted to receivesaid' spark-plug` a pair of links pivotally secured to said socket onopposite sides thereof, a yoke pivot-all secured to said links adaptedto straddle t. e casing and rest on the flange thereof, and a set-screwpassing through the yoke and bearing on the flange of the easing.

3. A spark-plug provided with a. metallic casing having an annulerflange, a socket adapted to receive said spark-plug, n pair of linkspivotally secured to said socket, a

yoke pivotally secured to said links, the yoke being provided witli alug on its upper edge,

adaptii tobear u n the ilang'e casing.

4. A spark-plug*comprising a metallic casing provided with an internalshoulder and an external flange, an insulating member having an annular'enlarged portion, said insilhtiorbeing inserted into the casing, theenlar ed portion thereof resting on the Shouller of the casing, ascrew-plug adapted to hold said insulator in place, an electrode passingthroughl the insulator, a socket adapted to receive the metallic casing,a gasket interposed between the flange. of the casig andithesooket.,Enir of links pivotally secured to said soc et, n yoke pivotally securedto said links, and n set--si-rew passing through the yoke and adapted tobear upon the annuler flange of the casing. In testimony whereof I niixmy signature, in presence of two witnesses.

WILLIAM F. SPRENGNETIIER. VVitnesSeS:

HARRY A. BEIMns, y ELSE M. SIEGEL.

